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Tenascin-C (TNC), a very large multimeric glycoprotein, is overexpressed in human glioblastomas, leading to a highly motile and invasive phenotype of glioma cells. However, the regulation of TNC expression in glioma has remained unclear until now. Our data suggest that interleukin-33 (IL-33) may promote the accumulation of TNC protein by autocrine or paracrine modes of action in glioma. In the present study, the expression levels of TNC, IL-33, and ST2 were measured in glioma tissue specimens, and the impact of altered IL-33 expression on TNC was investigated  in vitro  and  in vivo . In contrast with control treatment, IL-33 treatment increased TNC expression, and knockdown of IL-33 attenuated TNC expression in glioma cells. Furthermore, IL-33 induced the activation of nuclear factor κB (NF-κB) and increased the expression of TNC in U251 cells. In addition, blockage of the IL-33-ST2-NFκB pathway resulted in downregulation of TNC production. IL-33 promoted glioma cell invasion by stimulating the secretion of TNC. Similarly, knockdown of TNC inhibited the invasiveness of glioma cells. These findings provide a novel perspective on the role of the IL-33/NF-κB/TNC signalling pathway in supporting cancer progression. Thus, targeting the IL-33/NF-κB/TNC signalling pathway may be a useful therapeutic approach in glioma.

IL-33/ST2 axis promotes glioblastoma cell invasion by accumulating tenascin-C